Returns a RuleTrace starting with the first RuleTrace.Atomic element or the first sub-trace whose offset from the reported error index is zero (e.g.
Returns a RuleTrace starting with the first RuleTrace.Atomic element or the first sub-trace whose offset from the reported error index is zero (e.g. the RuleTrace.Terminal). If this is wrapped in one or more RuleTrace.NonTerminal.Named the outermost of these is returned instead.
Wraps this trace with a RuleTrace.Named wrapper if the given name is non-empty.